fix: add hardcoded accelerators to Show Places/Treeview GtkActionEntry

apply_keybinding() skips default-valued keys and relies on the
GtkActionEntry's own accelerator being set. Since we had NULL,
the accel map entry was never registered and the shortcuts did nothing.

Author: smpl-os

src/nemo-window-menus.c

@@ -2274,9 +2274,9 @@ static const GtkActionEntry main_entries[] = {
     G_CALLBACK (action_tabs_move_right_callback) },
   { "Sidebar List", NULL, N_("Sidebar") },
   { "Toolbar List", NULL, N_("Toolbar") },
-  { NEMO_ACTION_SHOW_PLACES, NULL, N_("Show _Places Sidebar"), NULL, N_("Switch to Places sidebar panel"),
+  { NEMO_ACTION_SHOW_PLACES, NULL, N_("Show _Places Sidebar"), "<Alt><Shift>p", N_("Switch to Places sidebar panel"),
     G_CALLBACK (action_show_places_callback) },
-  { NEMO_ACTION_SHOW_TREEVIEW, NULL, N_("Show _Tree Sidebar"), NULL, N_("Switch to Tree sidebar panel"),
+  { NEMO_ACTION_SHOW_TREEVIEW, NULL, N_("Show _Tree Sidebar"), "<Alt><Shift>t", N_("Switch to Tree sidebar panel"),
     G_CALLBACK (action_show_treeview_callback) },
 };